Ign timing
Thread Starter
Instructor
Joined: Jan 2012
Posts: 214
Likes: 6
From: Mebane, NC
Ign timing
73 350 4spd. PO installed an 81 crate motor, said he added a slightly more agressive cam. If I remember correctly the timing is set at 8 with the vacuum plugged. Car runs fine, coming up on 2000 since the new motor was installed, figure it's time for a tune up. No MSD. Does the different cam make any difference on the timing? My pubs don't cover the 81 engine. What is the correct timing?
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
Read these,
http://www.corvette-restoration.com/...ine_Timing.pdf
http://www.digitalcorvettes.com/foru...ad.php?t=75830
http://www.corvette-restoration.com/...ine_Timing.pdf
http://www.digitalcorvettes.com/foru...ad.php?t=75830
Last edited by Revi; Oct 29, 2014 at 10:06 AM.
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
You cam can affect timing but it depends on how you would use your vacuum adv but since you don't have any, your only concern is how fast the mechanical advance comes in. In most mild engines you want @36 timing advance in by 3000 rpm. This is a very generic guideline. If you like getting the most out of your engine. I would advise bumping the timing up until it cracks hard or pings when hot under load. Then back off a little. A dial back timing light can tell you if your getting full advance at 3000 rpm if you want to take it to the next level...
Last edited by hugie82; Oct 29, 2014 at 10:46 AM. Reason: Spelling
